D arcy poeter



(No Modelf). 4

` DA. PORTER.

ROTARY SHUTTLE AND MECEANISM EOE OPERATING TEE SAME. No. 358,750. Patented Mar. 1, 1 88'7.

N. PETERS vhotumngnphar, Wnshington. D. C.

IlNrTao STATES PATENT OFFICE.

DARCY PORTER, OF CLEVELAND, OHIO, ASSIGNOR TO THE WHITE SEIN ING MACHINE COMPANY, OF SAME PLACE.

ROTARY SHUTTLE AND IVIECHANlSiVI FOR OPERATING THE SAME.

SPECIFICATION forming part of Letters Patent No. 358,750, dated March l, 1887.

Application filed February 1, 1586. Seria] No.190,432.

To ZZ whom it may concern:

Be it known that I, DAROY PORTER, of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Rotary Shuttles and Mechanism for Operating the Same; and I do hereby declare the following to be a full, clear, and eX- act description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

My invention relates to improvements in rotary shuttles and mechanism for operating the same, in which a steady-pin operating in a chamber of the shuttle-driver shaft is made, by means of a cam or other suitable device, to advance endwise at the proper time and enter a socket in the shuttle to support the same lat erally, to the end that the shuttle is not pressed by the draft of the thread or other cause against the notched side of the shuttle-race, thereby saving friction and undue wear of the parts.

The steady-pin and the socket in the shuttle are made correspondingly rectangular or other suitable shape in crosssection, and of spiral shape longitudinally, like the grooves of a rifle-barrel, the spiral leading in the direction that causes an advance of the shuttle when the steady-pin enters the socket, to the end that the heel of the shuttle is separated from the driver at the time that the thread-loop passes this point. This class of shuttles are cut away 011 the side where the driver operates, by reason of which these shuttles are seldom or never perfectly balanced, and will consequently vibrate if run fast; also, the shuttle-race for some distance on top is necessarily cut away, leaving much less \\ea1-ingsurfacc on top to engage the shuttle. The upward vibration of the shuttle as the heavy side comes uppermost and the upward draft of the thread caused by the take-up occur about the same time, both or either of which causes the shuttle to press intermittently but heavily against the upper side of the shuttle-race, and the limited surface of the race at this part is quickly worn away. I have therefore devised other means than the raceto wit, a steady-pin-for supporting the shuttle during the time that the excessive upward pressure is had.

The steady-pin is also utilized to advance (No model.)

the shuttle and separate for a momentthe heel thereof 'from the driver, so that the thread may pass out unobstructed.

In the accompanying drawings, Figure l is a side elevation in section of portions of a sewingmachine embodying my invention, the bobbin and bobbin-case being removed from the shuttle. Fig. 2 is an enlarged front elevation of the shuttle, shuttle-race, &c., the cap of the shuttlerace being removed. Fig. 3 is 6o an enlarged elevation in detail of the steadypin. y

A represents the shuttle, B the shuttlerace, c the driver, and C the drivershaft. The shuttle, between the point a and heel a', A65 is eut away to receive the driver c. The race on top, between `the points b and b', is eut away, leaving the necessary opening present ing upward. The shuttle has a hub, A', on which i's mounted the bobbin and bobbin-case. 7o This hub has a central chamber or socket, a2. The shaft C is journaled in suitable boxes underneath the clotlrplate F. The parts thus far described, except the socket a2, may be of the ordinary and weltknown construction. 7 5 The shaft C has a longitudinal bore, in which operates the pin E, the latter having an easy fit, so that it may reciprocate endwise. A sleeve, G, is mounted loosely on the shaft, and is connected rigidly with the center pin, E, by 8o means of a lateral pin, e, that passes through a slot, c', of the shaft, by which arrangement the sleeve and pin E are made to move in unison and turn with the shaft. A small roller, H, mounted on a stud, h, the latter being secured to the cloth-plate, engages the eamgroove g of the sleeve G, by means of which the sleeve and steady-pin E are reciproeated endwise. The end E of the pin E, as it protrudes from the shat, enters and fits nicely in 9o the socket a2 of the shuttle-hub, The pin, dur ing its engagement with the shuttle, steadies the latter, supports and holds it concentric with the race, and the parts are timed so that this support of the steady-pin comes when it is most needed, when the upward pressure of the shuttle would otherwise be sustained by the points b and b', which in consequence (and especially the latter', b) would soon be worn so as to interfere with the perfect working of [oo be made round in cross-section.

together.

the shuttle. During the time that the thread is passing across the center of the shuttle the steady-pin is drawn back into the shaft C, and is out of the Way, so that it does not in the least interfere with forming the stitches or with any parts performing its functions. So far as the steadying of the shuttle is concerned, the steady-pin and socket inthe shuttle might The thread, as it is drawn out between the driver and heel A,.meets with considerable resistance, which latter it is desirable to remove. I have therefore devised t-he following: The hole in the shuttle and the engaging part e of the steadypin are made to correspond, but are made out of round, so that the two parts While engaging eachother will of necessity rotate The parts are twisted a trifle, like the twist in the grooves of a ride-barrel, the lead'being in the direction that advances the shuttle in the direction that the shuttle is moving, when the steady-pin enters thesocket, such advance being just enough to separate the heel of the shuttle from the drivel', by means of which separation the thread is allowed to pass out without resistance.

rlhe peculiar form in cross-section of the steady-pin or of the socket ai is not essential7 triangular, rectangular, polygonal, or round and grooved, either will answer the purpose,

and it is only a question which form can be made the cheaper. The spiral lead for advancing the shuttle, as aforesaid, is not necessarily confined to the socket a2 and the part E, but might be made in the slot c; but this latter construction would probably loe too expensive to make; also, the cam movement for reciprocating the steady-pin may be modified in various Ways without departing from the spirit and purpose of my invention.

1. In a sewing-machine, the combination, with a driver-shaft and a revolving shuttle having a recess or opening therein, of a reciprocating steady-pin located within the drivershaft and adapted to enter the opening in the shuttle, and mechanism for intermittingly reciprocating the stead y-pin, substantially as set forth.

2. In a sewing-machine mechanism, the combination, with a revolving shuttle having a recess therein, of a reciprocating pin for intermittingly engaging the shuttle, the said recess and pin having a spiral lead for the purpose of advancing the shuttle when the steady-pin engages the latter, substantially as set forth.

VIn testimony whereof I sign this specification, in the presence of two witnesses, this 20th day of January, 1886.

GHAs. H. DORER, ALBERT E. LYNCH. 

